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annotate libtwamr/p_ol_wgh.h @ 477:4c9222d95647

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libtwamr encoder: always emit frame->mode = mode; In the original implementation of amr_encode_frame(), the 'mode' member of the output struct was set to 0xFF if the output frame type is TX_NO_DATA. This design was made to mimic the mode field (16-bit word) being set to 0xFFFF (or -1) in 3GPP test sequence format - but nothing actually depends on this struct member being set in any way, and amr_frame_to_tseq() generates the needed 0xFFFF on its own, based on frame->type being equal to TX_NO_DATA. It is simpler and more efficient to always set frame->mode to the actual encoding mode in amr_encode_frame(), and this new behavior has already been documented in doc/AMR-library-API description in anticipation of the present change.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 18 May 2024 22:30:42 +0000
parents 48c7f8e8c9af
children
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1 /*
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2 ********************************************************************************
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3 *
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4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
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5 * R99 Version 3.3.0
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6 * REL-4 Version 4.1.0
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7 *
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8 ********************************************************************************
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9 *
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10 * File : p_ol_wgh.h
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11 * Purpose : Compute the open loop pitch lag with weighting.
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12 *
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13 ********************************************************************************
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14 */
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15 #ifndef p_ol_wgh_h
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16 #define p_ol_wgh_h "$Id $"
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17
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18 /*
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19 ********************************************************************************
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20 * INCLUDE FILES
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21 ********************************************************************************
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22 */
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23 #include "tw_amr.h"
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24 #include "typedef.h"
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25 #include "vad.h"
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26
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27 /*
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28 ********************************************************************************
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29 * DEFINITION OF DATA TYPES
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30 ********************************************************************************
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31 */
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32 /* state variable */
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33 typedef struct {
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34 Word16 old_T0_med;
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35 Word16 ada_w;
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36 Word16 wght_flg;
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37 } pitchOLWghtState;
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38
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39 /*
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40 ********************************************************************************
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41 * DECLARATION OF PROTOTYPES
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42 ********************************************************************************
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43 */
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44
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45 void p_ol_wgh_reset (pitchOLWghtState *st);
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46 /* reset of pre processing state (i.e. set state memory to zero)
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47 returns 0 on success
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48 */
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49
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50 Word16 Pitch_ol_wgh ( /* o : open loop pitch lag */
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51 pitchOLWghtState *st, /* i/o : State struct */
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52 vadState *vadSt, /* i/o : VAD state struct */
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53 Word16 signal[], /* i : signal used to compute the open loop pitch */
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54 /* signal[-pit_max] to signal[-1] should be known */
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55 Word16 pit_min, /* i : minimum pitch lag */
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56 Word16 pit_max, /* i : maximum pitch lag */
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57 Word16 L_frame, /* i : length of frame to compute pitch */
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58 Word16 old_lags[], /* i : history with old stored Cl lags */
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59 Word16 ol_gain_flg[], /* i : OL gain flag */
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60 Word16 idx, /* i : index */
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61 Flag dtx /* i : dtx flag; use dtx=1, do not use dtx=0 */
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62 );
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63
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64 #endif